We are experiencing an issue with our ZENworks window logging out and losing a number of available icons.

The ZCM Server (10.3.3) was restarted on Friday night to try to resolve an issue where the content of any newly created bundles was not replicating to the primary server correctly, resulting in a status of Unavailable.
The restart has fixed that problem, however this morning (Monday), we are experiencing an issue where a number of icons in the ZENworks window are disappearing and we have to re-login to ZENworks to bring them back.
This has occurred on my machine at least twice this morning.

Can anyone shed any light on this behaviour?